Grace, a girl who lost her parents and even had her family house taken from her. For thirteen years, the only thing she held in her heart was revenge. And Ares, a man who lost everything to the very same enemy. For the sake of revenge, Grace proposes a fake relationship to him, and the two enter into a cold, calculated contract. However, emotions that take root within the flames of revenge slowly spread into love, and they begin to fear that those feelings may become an obstacle to their revenge… Standing between revenge and love, what choice will the two of them make as they race toward the end?